package cn.lynu.lyq.java_exam.dao;import java.io.File;import java.util.List;import cn.lynu.lyq.java_exam.entity.Grade;import cn.lynu.lyq.java_exam.entity.Student;public interface StudentDao {	Student findByRegNoAndPassword(String regNo, String password);	List<Student> findStudentForSearch(String regNo, String name, Boolean gender, String gradeName);	Student findById(int id);	List<Student> findAll();	List<Student> findByGrade(Grade g);	void save(Student s);	void update(Student s);	void delete(Student s);	int importFromTxt(File file);}